Keep Only the Highest Set Bit

Code

#include <stdio.h>
#include <stdint.h>

// Complete the function
uint16_t highest_set_bit(uint16_t reg) {
   for(int8_t i=15;i>=0;i--)
   { uint16_t a=1;
      if(reg&(a<<i))
      {
        reg=(a<<i);
        return reg;
      }
   }return reg;
}

int main() {
    uint16_t reg;
    scanf("%hu", &reg);

    uint16_t result = highest_set_bit(reg);
    printf("%hu", result);
    return 0;
}

Solving Approach